@misc{indiciae4c634e01c40e,
  title = {The Jabal Guyan ancient gold mine, Wadi Malahah quadrangle (sheet 18/43D), Kingdom of Saudi Arabia},
  author = {A. M. Helaby and F. C. W. Dodge},
  year = {1977},
  doi = {10.3133/ofr7799},
  url = {https://pubs.usgs.gov/publication/ofr7799},
  note = {Source identifier: ofr7799}
}